Hi JennyJoan, I wear varifocals and like your sister, I was offered the extra test, I was told it was to see had I any illnesses that would show at the back of my eye, I declined, I know if I am unwell or whatever - I'll go to the doc then, no point in worrying from an eye test. Something like the eyes are the window to your soul the optician can now see if we're gonna be ill by paying them an extra few bob, I'm also like ael, I spend ages looking for my glasses (that should be on me all day) but find them on my head like a hairband more often than not